Pane arrangement having an electrically heatable baffle plate

ABSTRACT

A pane arrangement having an electrically heatable baffle plate is described. The pane arrangement has a pane having an enclosure on the inner side of the pane, a radiation receiver and/or a radiation source facing the pane within the enclosure such that a beam path of electromagnetic radiation passes through a predefined region of the pane, a baffle plate arranged within the enclosure and below the beam path, and an electrically heatable area in the baffle plate heating the region.

CROSS REFERENCE TO RELATED APPLICATIONS

The present application is a continuation of U.S. patent applicationSer. No. 14/371,107, filed Jul. 8, 2014, which is the US national stageof International Patent Application PCT/EP2013/052268 filed on Feb. 6,2013 which, in turn, claims priority to European Patent Application EP12158006.2 filed on Mar. 5, 2012, the contents of all of which areincorporated by reference in their entireties.

BACKGROUND OF THE INVENTION

The invention relates to a pane arrangement having an electricallyheatable baffle plate, in particular for heating an opticallytransparent pane region by means of radiant heat, a method for itsproduction, and its use.

Many motor vehicles, airplanes, helicopters, and ships are equipped withvarious optical sensors. Examples of optical sensors are camera systems,such as video cameras, night vision cameras, residual light amplifiers,or passive infrared detectors, such as FLIR (forward looking infrared).The camera systems can use light in the ultraviolet (UV), visible (VIS),and infrared wavelength range (IR). Thus, even under bad weatherconditions, such as darkness and fog, objects, motor vehicles, andpeople can be precisely detected. These camera systems can be placed inmotor vehicles behind the windshield in the passenger compartment. Thus,even in traffic, they offer the possibility of detecting hazardoussituations and obstacles in a timely manner.

There are additional fields of application for optical sensors inelectronic distance measurement (EDM), for example, using laser rangefinders. The distance to other motor vehicles can be determined. Suchsystems are widely used in the military sector but there are manypossible applications in the civilian sector as well. With measurementsof the distance from the preceding vehicle, it is possible to determinethe necessary safe following distance and significantly increase trafficsafety.

Because of their sensitivity to weather conditions or aerodynamicsaround the vehicle, such sensors must, in all cases, be protected byappropriate panes. The sensor can either be installed inside a motorvehicle or outside as with thermal imaging cameras of helicopters. Inthe latter case, the sensor is installed outside on the helicopter in apivotable housing. To ensure optimal function of the optical sensors,with both options, clean and condensation-free panes are absolutelyessential.

The same is true for radiation sources that are arranged on the innerside of motor vehicle glazings. Such radiation sources are, for example,optical lighting elements, such as a third brake light behind a rearwindow. The optical lighting elements shine through a pane region,which, for aesthetic and practical reasons is usually not heated byheating conductors. This is, for example, the case, when this region ofthe pane is used for antennas that are not connected to the heatingfield.

Condensation and icing hamper the functioning of the sensors and thelight sources since they significantly reduce the transmission ofelectromagnetic radiation. Whereas wiper systems can be used for waterdrops and dirt particles, they are, as a rule, inadequate in the case oficing. In this case, systems that at least briefly heat the pane segmentassociated with the sensor or the light source when needed and thusenable uninterrupted use are essential.

In addition to the external pane surface, the inside pane above all mustbe kept free of condensation. So that no dirt and dust particles foulthe sensor or the light source, the arrangement consisting of the sensoror light source and pane is, as a rule, encapsulated. If moisturepenetrates into this encapsulated space, this moisture can, especiallywith cold outside temperatures, condense on the inside of the pane andrestrict transmission through the pane region.

DE 101 56 850 A1 discloses a sensor in a motor vehicle window pane, thelens of which sensor is sealed off from the vehicle interior by anenclosure. This construction prevents the deposition of dust particleson the lens. A particle filter is provided for air exchange.

DE 10 2004 054 161 A1 discloses an infrared detection region in a motorvehicle windshield. The infrared detection region is surrounded byheating elements that keep it free of ice and condensation by thermalconduction.

EP 1 605 729 A2 discloses an electrically heatable pane with a camerawindow. This camera window is kept free of condensation and ice by aheating arrangement. The heating element is laminated into the pane atthe position of the camera window. Also, an additional heating elementcan be applied on the surface of the pane. The additional heatingelement is preferably printed onto the surface of the pane as conductivepaste.

US 2011/0204037 A1 discloses a heating arrangement for the region of thewiper resting position of windshields. The heating of this region of thewindshield is generated by direct contact of the windshield with theheating element or by valves with warm air.

WO 2004/020250 A1 discloses a method and a device for fastening a sensoron a motor vehicle window.

The object of the invention consists in making available an improvedpane arrangement with a heatable baffle plate, which enables heating aregion of the pane and is simply and economically producible fromfinished, standard panes without major retrofitting measures.

The object of the present invention is accomplished according to theinvention by means of a pane arrangement having an electrically heatablebaffle plate according to independent claim 1. The invention furthercomprises a method for its production and its use according toindependent claims 13 and 14. Preferred embodiments emerge from thesubclaims.

The pane arrangement according to the invention comprises at least:

-   -   a pane with an enclosure on the inner side of the pane,    -   a radiation receiver that is turned toward the pane within the        enclosure such that a beam path of electromagnetic radiation        passes through a predefined region of the pane,    -   a baffle plate that is arranged within the enclosure and below        the beam path, and    -   an electrically heatable area in the baffle plate that heats the        region.

An alternative pane arrangement according to the invention comprises atleast:

-   -   a pane with an enclosure on the inner side of the pane,    -   a radiation source that is turned toward the pane within the        enclosure such that a beam path of electromagnetic radiation        passes through a predefined region of the pane,    -   a baffle plate that is arranged within the enclosure and below        the beam path, and    -   an electrically heatable area in the baffle plate that heats the        region.

When the electrically heatable area is heated, it emits thermalradiation and heats the predefined region of the pane by means of thethermal radiation. For this, it is necessary that the beam path of theradiation receiver or the radiation source run between the predefinedregion of the pane and the baffle plate, so that the beam path is notobstructed or restricted.

The pane arrangement comprises at least one pane and at least onepredefined region of the pane. The predefined region must be transparentto the electromagnetic information or signals that are to be received bythe radiation receiver or that are to be transmitted through the regionby the radiation source. The region can be any part of the pane or aninserted pane segment that has high transmission for the correspondingoptical electromagnetic signals. The characteristic “transparent”refers, in the context of the invention, to the transparency in thewavelength range relevant for the radiation receiver or the radiationsource. For radiation receivers or radiation sources in the visiblerange and/or in the infrared range, the transmission for wavelengthsfrom 200 200 nm to 2000 nm is preferably more than 60%, particularlypreferably >70%, and in particular >90%. For radiation receivers orradiation sources in the infrared range, the transmission in thewavelength range from 800 nm to 1300 nm is preferably more than 60%,particularly preferably >70%, and in particular >90%. The regionpreferably takes up less than 10%, particularly preferably less than 5%of the surface of the pane.

The radiation receiver according to the invention is, for example, acamera or a light-sensitive sensor that can detect infrared, visible,and/or ultraviolet electromagnetic radiation. The radiation receiverpreferably includes cameras for visible light of the wavelengths from400 nm to 800 nm and/or infrared light of the wavelengths from 800 nm to1300 nm.

The radiation source according to the invention is preferably a lightsource, for example, at least one incandescent bulb or a light emittingdiode that can emit infrared, visible, and/or ultravioletelectromagnetic radiation.

The enclosure protects the radiation receiver or the radiation sourceagainst dirt and dust particles as well as unwanted incident light. Theenclosure is preferably arranged in the upper pane region, preferably nofarther than 30% of the pane height from the upper and/or lower edge.The enclosure preferably contains a polymer, particularly preferablypolybutylene terephthalate, polyamides, polycarbonate, polyurethanes,polybutylene, polypropylene, polyethylene, polyethylene terephthalate,polyvinyl chloride, polystyrene, acrylonitrile butadiene styrene,ethylene vinyl acetate, ethylene vinyl alcohol, polyimides, polyesters,polyketones, polyether ether ketones, and/or polymethyl methacrylate aswell as mixtures, block polymers, and copolymers thereof.

The pane preferably contains glass and/or polymers, preferably flatglass, float glass, quartz glass, borosilicate glass, soda lime glass,polymethyl methacrylate, polycarbonate, and/or mixtures or layeredcomposites thereof. The pane preferably comprises single pane securityglass (ESG) or laminated security glass (VSG).

The predefined region preferably has an opaque and/or colored edge. Theedge can be implemented both as an edge strip or as an edge region.

The baffle plate according to the invention has an electrically heatablearea. The baffle plate is arranged such that the beam path of theelectromagnetic radiation that the radiation receiver receives or thatthe radiation source emits is situated between the baffle plate and thepane. This refers in particular to the part of the beam path that runswithin the enclosure. The electrically heatable area can be a separatecomponent that is, for example, bonded to the baffle plate, for example,glued, soldered, pressed on, or welded. The electrically heatable areacan also be a region of the material of the baffle plate.

It is particularly advantageous for the predefined region and theelectrically heatable area to run as nearly parallel as possible suchthat the thermal radiation that leaves the electrically heatable areastrikes the region of the pane as nearly perpendicular as possible.Moreover, it is advantageous for no other components or parts of theenclosure to be able to shield the thermal radiation.

If the heatable area of the baffle plate and of the predefined region ofthe pane through which the beam path runs are arranged in parallel, amuch greater installation space is required, which, in the case of anarrangement on a motor vehicle pane, protrudes undesirably far into theinterior. In an advantageous embodiment of the invention, the angle ccbetween the predefined region and the baffle plate is from 5° to 65° andpreferably from 10° to 45°. Thus, a flatter arrangement of the baffleplate on the pane is enabled.

The electrically heatable area of the baffle plate advantageously has afootprint of 20 cm² to 300 cm², preferably of 20 cm² to 40 cm² forarrangements on a windshield and of 100 cm² to 300 cm² for rear windowsof motor vehicles. The base area is preferably trapezoid shaped, withthe larger of the two parallel sides arranged directly adjacent thepane.

In an advantageous embodiment of the invention, the heating output ofthe electrically heatable area is selected such that it has atemperature from 30° C. to 90° C., preferably 50° C. to 70° C. For this,typically, a heating output from 0.5 W/dm² to 10 W/dm² is required. Suchheating output is sufficient to free the inner side of the pane ofcondensation in the predefined region under the standard conditions ofmotor vehicle engineering by means of radiant heat.

In another advantageous embodiment of the invention, the electricallyheatable area has radiated power from 0.5 W/dm² to 5 W/dm². Suchradiated power is sufficient to free the inner side of the pane ofcondensation in the predefined region under the standard conditions ofmotor vehicle engineering by means of radiant heat.

A baffle plate according to the invention advantageously has thermalconductivity of more than 80 W/(m K), preferably more than 190 W/(m K),particularly preferably more than 300 W/(m K) auf. The surface of thebaffle plate advantageously has emissivity of 0.7 to 0.97. For this, thebaffle plate according to the invention advantageously contains, or ismade of, a metal, preferably aluminum, copper, spring bronze, and/orsteel. Baffle plates made of aluminum can, for example, be manufacturedin bulk by the meter in continuous casting. Baffle plates made of copperare preferably pressed or stamped from solid copper plates.

In particular, the baffle plate is made of aluminum, of which thesurface facing the pane has been black anodized. This has the particularadvantage that scattered light that enters from outside through the paneinto the enclosure is not reflected into the radiation receiver and,consequently, causes no interference signals.

In an advantageous embodiment, the baffle plate is patterned on thesurface facing the pane and, in particular, on the side facing the beampath. The patterning is, for example, fluting or a zigzag or wave-shapedform. This has the particular advantage that, as much as possible,scattered light is not reflected into the radiation receiver.

The baffle plate according to the invention can advantageously include aheatable coating and/or heating wires. The coating or the heating wirespreferably contain fluorine-doped tin dioxide (F:SnO₂), tin-doped indiumoxide (ITO), silver, copper, tin, gold, aluminum, iron, tungsten,chromium, or alloys thereof and/or at least one electrically conductiveorganic polymer. The heatable coating preferably has a layer thicknessof 0.1 μm to 50 μm, particularly preferably 1 μm to 10 μm.

An alternative baffle plate according to the invention contains in afirst region, outside the electrically heatablen area, a heatingelement, preferably a heating cartridge. Such heating cartridges areparticularly economical and easy to install. Due to the high thermalconductivity of the material of the baffle plate, the entire baffleplate is heated. This results in indirect heating of the heatable areaand, in turn, to radiant heating of the region.

The enclosure is advantageously bonded to the pane by an adhesive. Theadhesive preferably contains acrylic adhesives, methyl methacrylateadhesives, cyanoacrylate adhesives, polyepoxides, silicone adhesives,and/or silane-curing polymer adhesives as well as mixtures and/orcopolymers thereof.

The enclosure is advantageously designed in multiple parts, with asupport part bonded to the pane by an adhesive and a cover for servicepurposes detachably connected to the support part.

The enclosure is preferably arranged in the upper region of thewindshield and/or rear window, particularly preferably behind a coverstrip, a sunshield, and/or a band filter.

The enclosure preferably contains water absorbent materials ordesiccants, particularly preferably silica gel, CaCl₂, Na₂SO₄, activatedcarbon, silicates, bentonites, zeolites, and/or mixtures thereof. Thedesiccants can be incorporated into the surface of the enclosure and/orarranged in open containers in the enclosure. The desiccants arepreferably arranged such that an air and moisture exchange with the airin the interior of the enclosure is possible, but the materials arefixed and cannot fly around. This can preferably be accomplished byenclosing the desiccants in an air and moisture permeable polymer filmor in a fine meshed net.

The invention further comprises a method for producing a panearrangement having an electrically heatable baffle plate, wherein

-   a. the enclosure is fastened to the predefined region of the pane,-   b. the radiation receiver and/or the radiation source is arranged in    the enclosure, and-   c. the baffle plate is arranged in the enclosure, with the beam path    of the radiation receiver and/or the radiation source running    between the pane and the baffle plate.

The invention further comprises the use of the pane arrangementaccording to the invention in motor vehicles, ships, airplanes, andhelicopters and preferably as a windshield and/or rear window of a motorvehicle.

It is understood that the different embodiments can be realizedindividually or in any combinations. In particular, the characteristicsmentioned above and to be explained in the following can be used notonly in the combinations indicated but also in other combinations oralone, without departing from the scope of the present invention.

The invention is explained in detail in the following with reference todrawings. The drawings are schematic depictions and not true to scale.The drawings in no way restrict the invention.

They depict:

FIG. 1 a top plan view of an exemplary embodiment of a pane arrangementaccording to the invention,

FIG. 2 a simplified, schematic representation of a cross-section of apane arrangement according to the invention,

FIG. 3 a cross-section of a detail of a pane arrangement according tothe invention,

FIG. 4 a cross-section of a detail of an alternative embodiment of apane arrangement according to the invention,

FIG. 5 a cross-section of a pane arrangement according to the invention,

FIG. 6a a flowchart of a preferred embodiment of the method according tothe invention, and

FIG. 6b a flowchart of an alternative embodiment of the method accordingto the invention.

FIG. 1 depicts a top plan view of a pane arrangement 100 according tothe invention. An enclosure 6, a radiation receiver 3 a, and a region 2that is predefined by the beam path 5 through the pane 1 are arranged inthe upper region of the pane 1. The beam path 5 has an upper edge 5.1and a lower edge 5.2.

FIG. 2 depicts a simplified, schematic representation of a cross-sectionalong section line A-A′ of FIG. 1. The enclosure 6 is arranged on theinner side II of the pane 1. In the case of a motor vehicle pane, theinner side II is the side of the pane 1 turned toward the vehicleinterior.

Within the enclosure 6 and below the pane 1, a radiation receiver 3 a isarranged. The beam path 5 of the radiation receiver 3 a runs in a funnelshape from the emission lens of the radiation receiver 3 a through thepane 1. The beam path 5 of the visual field penetrates the pane 1 in aregion 2 that lies between the upper edge 5.1 of the beam path 5 and thelower edge 5.2 of the beam path 5. The region 2 must be sufficientlytransparent to the electromagnetic radiation 15 of the radiationreceiver 3 a.

Below the radiation receiver 3 a, a baffle plate 4 is arranged. Thebaffle plate 4 reaches from the radiation receiver 3 a all the way tothe pane 1. The baffle plate 4 is arranged outside and, in particular,below the beam path 5 of the radiation receiver 3 a, in order not torestrict the beam path 5. The baffle plate 4 borders the region 2 of thepane 1 at an angle cc of, for example, 30°.

The baffle plate 4 has on the top surface 20 an electrically heatablearea 7. The electrically heatable area 7 can be heated directly, forexample, by a heating conductor on the surface 20. The electricallyheatable area 7 can also be heated indirectly, for example, by anelectrical heating element in another region of the baffle plate 4, withthe electrically heatable area 7 heated by the thermal conduction of thematerial of the baffle plate 4.

The electrically heatable area 7 is arranged opposite the region 2 ofthe pane 1. When the electrically heatable area 7 is heated, it heatsthe region 2 of the pane 1 by thermal radiation 9 and thus frees it ofcondensation. For this, it is particularly advantageous for the region 2and the electrically heatable area 7 to run as nearly parallel aspossible such that the thermal radiation 9 that leaves the electricallyheatable area 7 strikes the region 2 of the pane 1 as nearlyperpendicular as possible. At the same time, a very large installationspace would be required that would protrude undesirably far into theinterior in the case of an arrangement on a motor vehicle pane.Consequently, a certain angle α of 5° to 45° and, for example, 30°, ispreferred.

FIG. 3 depicts a cross-section through a pane arrangement 100 accordingto the invention in the region of an enclosure 6. The cross-section runsalong the section line A-A′ of FIG. 1. The enclosure 6 is arranged onthe inner side II of a pane 1 and fastened on the pane 1 by gluing withan acrylic adhesive. The pane 1 is, for example, a windshield of a motorvehicle and, for example, a laminated safety glass. The inner side II isthe side of the pane 1 turned toward the vehicle interior. The enclosurecontains, for example, polybutylene terephthalate with a 10% fraction ofglass fibers (PBT-GF10) and was produced by an injection moldingprocess.

Within the enclosure 6 and below the pane 1, a radiation receiver 3 a isarranged. The radiation receiver 3 a is, for example, an infrared camerafor a night driving assistance system. The radiation receiver 3 adetects, in particular, infrared electromagnetic radiation 15 in thewavelength range from 800 to 1100 nm. The field of vision of theradiation receiver 3 a is oriented for image capture of the space infront of the vehicle. The beam path 5 of the field of vision runs in theshape of a funnel from the emission lens of the radiation receiver 3 athrough the pane 1. The beam path 5 of the field of vision penetratesthe pane 1 in a region 2. The region 2 must be sufficiently transparentto the infrared electromagnetic radiation 15 of the radiation receiver 3a. The pane 1 has, in the region 2, for example, a transparency forinfrared radiation in the wavelength range from 800 nm to 1100 nm ofmore than 70%. The radiation receiver 3 a is connected by supply lines13 to evaluation electronics (not shown).

A baffle plate 4 is arranged below the radiation receiver 3 a. Here,“below” means, in the case of a motor vehicle pane in the installedstate, vertical and closer to the bottom of the vehicle. The baffleplate 4 reaches from the radiation receiver 3 a all the way to the pane1. The baffle plate 4 is arranged below the beam path 5 of the radiationreceiver 3 a in order not to restrict the field of vision of the spacein front of the vehicle. The baffle plate 4 borders on the region 2 ofthe pane 1 at an angle cc of, for example, 30°.

The baffle plate 4 is made, for example, of aluminum with thermalconductivity of 200 W/(m K). The baffle plate 4 is black anodized on thesurface 20 visible through the pane 1 from outside. Furthermore, thesurface 20 has a zigzag or wave-shaped patterning 10. Thus, unwantedreflections from laterally entering scattered light into the radiationreceiver 3 a are reduced or prevented.

The baffle plate 4 has on the surface 20 an electrically heatable area7. In the example depicted, the heating of the area 7 is done by meansof an electrical heating element 11 on the bottom of the baffle plate 4.The footprint of the electrically heatable area 7 of the baffle plate 4is, for example, 35 cm². The electrical heating element 11 is, forexample, a heating wire or an electrically conductive coating and can beheated by an electric current. The heating element 11 is connected viasupply lines 12 to a voltage source, for example, to the onboardelectrical system of a motor vehicle.

If the electrical heating element 11 is heated by an electric current,the electrically heatable area 7 of the surface 20 of the baffle plate 4heats up due to the high thermal conductivity of the material of thebaffle plate 4. The heated area 7 is, in particular, suited to heat theregion 2 of the pane 1 by means of thermal radiation 9 and to thus freeit of condensation. As experiments of the inventor showed, a heatingoutput of 6 W/dm² suffices to keep the inner side II of the pane 1 of amotor vehicle free of condensation in the region 2 with an outsidetemperature of 0° C.

FIG. 4 depicts a cross-section of an alternative embodiment of a panearrangement 100 according to the invention. The pane arrangement 100corresponds to the pane arrangement 100 of FIG. 1. Instead of theradiation receiver 3 a, a radiation source 3 b is arranged within theenclosure 6. The radiation source 3 b contains, for example, ten redlight-emitting diodes and serves as a so-called “third brake light” onthe rear window of a motor vehicle. The enclosure 6 is, for example,arranged in an upper region of the pane 1, which has no printed-on orother heating structures. The electromagnetic radiation 15 of theradiation source 3 b penetrates the pane 1 in a region 2. By means ofthe thermal radiation 9 that leaves the electrically heatable area 7 ofthe baffle plate 4, the region 2 can be kept free of condensation.Furthermore, the thermal radiation accelerates deicing of the outer sideI of the pane 1 over the region 2.

FIG. 5 depicts a top plan view of another exemplary embodiment of a panearrangement 100 according to the invention. An infrared-reflecting,low-emissivity coating 16 based on indium tin oxide is arranged on theinner side II of the pane 1. Such infrared-reflecting coatings 16 are,for example, known from WO 2011/088330 A2. The coating 16 hastransparency for electromagnetic radiation in the visible range ofroughly 80%, but absorbs a large share of infrared electromagneticradiation. The coating 16 is removed within the enclosure 6 and, inparticular, in the region 2 of the beam path 5 of the radiation receiver3 a. As a result of the decoating, a large part of the infraredradiation 15 can arrive at the radiation receiver 3 a. The decoatedregion is hardly discernible anymore from the outside, due to theenclosure 6 on the inner side II of the pane 1 and the aestheticappearance of the pane 1 is retained.

In the example depicted, the heating element 11 is arranged in a region17 of the baffle pane 4 distant from the pane 1. The heating element 11is, for example, an economical and easy to install heating cartridge,which was pressed into an opening of the aluminum body of the baffleplate 4. The heat generated in the heating element 11 is passed on tothe region 18 and the area 7 due to the good thermal conductivity of thealuminum. The thus indirectly heated area 7 heats, by thermal radiation9, the region 2 of the pane 1. To protect the radiation receiver 3 aagainst excessively high temperatures, thermal insulation 8 is arrangedbetween the radiation receiver 3 a and the baffle plate 4. The thermalinsulation 8 contains, for example, a polymer and, in particular, thematerial of the enclosure 6.

FIGS. 6a and 6b depict, in each case, a flowchart of a method accordingto the invention for producing a pane arrangement 100 according to theinvention.

The present invention has a group of advantages compared to panearrangements according to the prior art. With pane arrangements withradiation receivers or radiation sources according to the prior art, thepane is customarily heated in the surroundings of the region throughwhich the electromagnetic radiation is transmitted. Since, if at allpossible, no heating conductors should cross this region, the heatingconductors are arranged on the outer edge of the region. The heating ofthe interior of the region occurs only by thermal conduction. Sinceglass is a poor thermal conductor, the region is very inhomogeneouslyand insufficiently heated. No satisfactory result can be obtained withthis type of heating of the region.

With the present invention, the region 2 is heated directly by thermalradiation 9. The transfer of sufficient heating output occurs only dueto thermal radiation. This permits uniform energy input to the region tobe heated. At the same time, it is possible to keep the necessary energyconsumption low.

The electrically heatable baffle plate 4 according to the invention issimple to integrate into an already existing enclosure 6 of a camera orof a third brake light and replaces there, for example, an alreadypresent non-heatable baffle plate. The power supply of the baffle plate4 according to the invention can take place simply via the power supplyof the camera or of the brake light.

For the person skilled in the art, it was unexpected and surprising thatthe transfer of thermal radiation with the pane arrangement according tothe invention is sufficient to keep the region to be heated free ofcondensation.

LIST OF REFERENCE CHARACTERS

-   1 pane-   2 region-   3 a radiation receiver-   3 b radiation source-   4 baffle plate-   5 beam path-   5.1 upper edge of the beam path 5-   5.2 lower edge of the beam path 5-   6 enclosure-   7 heatable area-   8 thermal insulation-   9 thermal radiation-   10 patterning, fluting-   11 heating element-   12 supply line to the heating element 7 or to the heating area 11-   13 supply line to the radiation receiver 3 a or to the radiation    source 3 b-   15 electromagnetic radiation-   16 coating-   17 first region of the baffle plate 4-   18 second region of the baffle plate 4-   20 surface of the baffle plate 4-   100 pane arrangement-   α angle between pane 1 and baffle plate 4-   I outer side of the pane 1-   II inner side of the pane 1-   III side of the baffle plate 4-   A-A′ section line

The invention claimed is:
 1. A pane arrangement having an electricallyheatable baffle plate, comprising: a pane with an enclosure on the innerside of the pane; a radiation receiver and/or a radiation source, whichis/are turned toward the pane within the enclosure such that a beam pathof electromagnetic radiation passes through a predefined region of thepane; a baffle plate, which is arranged within the enclosure and belowthe beam path; and an electrically heatable area in the baffle plate,which directly heats the predefined region by thermal radiation, whereinthe baffle plate has, outside the electrically heatable area, anelectrical heating element, and wherein the electrically heatable areais heatable by thermal conduction.
 2. The pane arrangement according toclaim 1, wherein the radiation receiver contains a camera or aphotosensor light-sensitive sensor for infrared, visible, and/orultraviolet electromagnetic radiation.
 3. The pane arrangement accordingto claim 1, wherein the radiation source contains an incandescent bulbor a light-emitting diode for infrared, visible, and/or ultravioletelectromagnetic radiation.
 4. The pane arrangement according to claim 1,wherein the baffle plate contains, or is made of, a metal.
 5. The panearrangement according to claim 1, wherein the baffle plate has thermalconductivity of more than 80 W/(m K).
 6. The pane arrangement accordingto claim 1, wherein the predefined region and the electrically heatablearea have each a substantially planar shape, and wherein an anglebetween a plane defining the predefined region and a plane defining theelectrically heatable area is from 5° to 65°.
 7. The pane arrangementaccording to claim 1, wherein the region has transparency forelectromagnetic radiation of >60%.
 8. The pane arrangement according toclaim 1, wherein the electrically heatable area has a heating output of0.5 W/dm² to 10 W/dm².
 9. The pane arrangement according to claim 1,wherein the baffle plate has a patterning on the side turned toward thebeam path.
 10. The pane arrangement according to claim 1, wherein thepane contains glass, polymers and/or mixtures thereof.
 11. The panearrangement according to claim 1, wherein the pane is of a substantiallyrectangular shape, and wherein the enclosure is arranged in an edgeregion of the pane between a center of the pane and an edge of the pane.12. A method for receiving and/or transmitting of electromagneticsignals through a pane, the method comprising: providing a pane having apredefined region that is transparent in a wavelength range ofelectromagnetic radiation; arranging a baffle plate in an inner side ofthe pane, the baffle plate having an electrically heatable area thatemits thermal radiation, and heating the predefined region of the paneby the thermal radiation, wherein the predefined region is configuredfor passage of electromagnetic signals that operate within thewavelength range, wherein the baffle plate has, at an edge of theelectrically heatable area, an electrical heating element, and whereinthe electrically heatable area is heatable by thermal conduction. 13.The method according to claim 12, wherein the arranging of the baffleplate is so that the thermal radiation strikes the predefined region ina substantially perpendicular direction.
 14. The method according toclaim 12, wherein the predefined region comprises an opaque and/orcolored edge that is not transparent in the wavelength range ofelectromagnetic radiation.
 15. The method according to claim 12, whereinreception of the electromagnetic signals is by way of a radiationreceiver arranged in the inner side of the pane that contains a cameraor a light-sensitive sensor for infrared, visible, and/or ultravioletelectromagnetic radiation.
 16. The method according to claim 12, whereintransmission of the electromagnetic signals is by way of a radiationsource arranged in the inner side of the pane that contains anincandescent bulb or a light-emitting diode for infrared, visible,and/or ultraviolet electromagnetic radiation.
 17. The method accordingto claim 12, wherein the predefined region and the electrically heatablearea have each a substantially planar shape, and wherein an anglebetween a plane defining the predefined region and a plane defining theelectrically heatable area is from 5° to 65°.
 18. The method accordingto claim 12, wherein the baffle plate has a patterning on a side of thebaffle plate that faces the predefined region.